Diagrams with classification results of the cluster ID27 in free (panels a)–h)) and in fixed solar metallicity (panels i)–p)) cases. The maximum likelihood in 4D parameter space is indicated in the 2D likelihood maps (panels c), d), f), h), k), l), n), p)) by a blue dot, and is surrounded by contours enclosing the 99% (blue line), 95% (green line), and 68% (red line) likelihood levels.